Further clarify dev install instructions

README.md

@@ -43,18 +43,43 @@ The [preloads](https://github.com/clojure/clojurescript/wiki/Compiler-Options#pr
 Now you can start up your application. Once it is loaded, press Ctrl+H to slide open the trace panel and enable tracing. When the panel is closed, tracing is disabled.
 
 
-## development
+## Development
 
-### setting up re-frame-trace for development
+### Setting up re-frame-trace for development
+
+You need both the re-frame-trace project _and_ a test project to develop it against. For example, you can use the [todo-mvc](https://github.com/Day8/re-frame/tree/master/examples/todomvc) project.
+
+- Clone `re-frame-trace` to your machine:
+
+  ```
+  git clone git@github.com:Day8/re-frame-trace.git
+  ```
+
+- Go into the root folder of the test project you're using to develop re-frame-trace with.
+
+  ```
+  cd /your/project/folder
+  ```
+
+- Add re-frame-trace into this test project using the [instructions](#getting-started) above.
+
+- Still in the test project, create a folder called `checkouts`, then enter the folder:
 
-- Clone `re-frame-trace` to your machine.
-- Go into the root directory of a project you'd like to use as a host to test re-frame-trace with. For example, you can use the [todo-mvc](https://github.com/Day8/re-frame/tree/master/examples/todomvc) project.
-- Add re-frame-trace into this project using the [instructions](#getting-started) above.
-- Create a folder called `checkouts:`
   ```
   mkdir checkouts
+  cd checkouts
   ```
-- Create a symlink from your local re-frame-trace project in the checkouts folder:
+
+- Create a [relative symlink](https://superuser.com/questions/146231/how-do-i-create-a-relative-symbolic-link-in-linux) from your local re-frame-trace project in the checkouts folder. For example:
+
   ```
-  ln -s path/to/your/local/re-frame-trace checkouts/re-frame-trace
+  ln -s ../relative/path/to/your/local/re-frame-trace re-frame-trace
   ```
+
+- If you're using figwheel in the test project, you need to add the checkouts folder (`checkouts/re-frame-trace/src`) to `:cljsbuild :source-paths` in the `project.clj` file. If you're having trouble locating the right place to put this, it might help to look to a sample [project.clj](https://github.com/technomancy/leiningen/blob/stable/sample.project.clj) for inspiration. For example:
+
+  ```
+  :cljsbuild {:builds {:client {:source-paths ["checkouts/re-frame-trace/src"]}}}
+  ```
+
+- Now run your test project however you usually run it, and re-frame-trace should be in there. \o/